Tool for removing fuel injectors

ABSTRACT

A tool for quickly and easily removing a fuel injector from the cylinder head by means of a bearing pin extending from a vertically elongated thrust bar into the overflow port of the injector. A threaded shaft bears against the cylinder head and, upon rotation, raises the thrust bar and exerts an upward force on the pin to free the injector.

United States Patent is] 3,670,389 Shepanski [451 June 20, 1972 541 TOOL FOR REMOVING FUEL [56] References Cited INJECTORS UNITED STATES PATENTS [72] inventor: Joseph F. Shepanski, 2i6 Huffman Mill l,499,082 6/1924 Stadier 4 ..29/256 R ad. Burlington. NC. 27215 2,1 13,755 4/1938 Billington ..29/256 MCKCC X 21 AppL No.: 98,467

Related US. Application Data Continuation-impart of Ser. No. 822,960, May 8, i969, abandoned.

u.s. Cl ..29/256 ..B23p 19/04 Field of Search ..254/10.s, 9a, 100;

Primary Examiner-Otheii M. Simpson Attorney-Clarence A. O'Brien and Harvey B. Jacobson A tool for quickly and easily removing a fuel injector from the cylinder head by means of a bearing pin extending from a vertically elongated thrust bar into the overflow port of the in jector. A threaded shaft bears against the cylinder head and,

upon rotation, raises the thrust bar and exerts an upward force on the pin to free the injector.

ABSTRACT 8 Claims, 4 Drawing Figures mmjaunzo m2 l lv gw sum 1 BF 2 INVENTOR JOSEPH F. sH BY W TTORNE mvmoa PANSKI, SR.

JOSEPH F- SHE ATTORNEY TOOL FOR REMOVING FUEL INJECTORS This is a continuation-in-part of application Ser. NO. 822,960, filed May 8, 1969 now abandoned.

It periodically becomes necessary to remove the fuel injector from the cylinder head of a Diesel engine for purposes of cleaning, repair or replacement. The removal is not easily accomplished, because the fuel injector is nestled under the rocker arms amongst the valve and bridge springs and is not in an easily accessible position (FIG. I Moreover, as a result of the combustion in the cylinder below, the fuel injector, which is seated in a bore in the cylinder head, becomes tightly wedged therein and sometimes almost bonded thereto. The usual procedure for removing such an injector is to lift the rocker arms and lifters out of the way in order to obtain access to the fuel injector and to pry the injector loose, using a flat pry bar to exert a lateral force on the injector until loosened to the point whereby it can be removed. In such a procedure, components adjacent the injector are frequently damaged and require replacement. Likewise, the use of the conventional pry bar will in many cases damage the injector itself, requiring additional servicing and increasing the cost of repairs.

The present invention, on the other hand, comprises a tool which bears against the surface of the cylinder head and through a pin which is positioned into the overflow port on the fuel injector, efl'ects a gradual smooth straight pulling of the injector from the cylinder head. The main body of the tool is lifted from the surface of the cylinder head by a lifting screw which in turn urges the bearing pin and engaged injector upwardly, freeing the injector without damage to the injector or any surrounding components.

It is therefore an object of the invention to provide an improved tool for easily and quickly releasing and removing fuel injectors from the cylinder head.

It is another object of the invention to provide a tool for releasing and removing fuel injectors, without damaging either the injectors or other components atop the cylinder head.

Other objects and features of the invention should be apparent from the following specification and claims when considered in connection with the accompanying drawings, in which:

FIG. I is a perspective, environmental view with parts broken away illustrating the top of a cylinder head showing the relationship of the fuel injector to the valve springs, rocker arms, and other components mounted thereon;

FIG. 2 is an elevation view of the tool itself removed from the fuel injector;

FIG. 3 is a perspective view illustrating a fuel injector having the tool according to the present invention assembled thereto; and

FIG. 4 is an exploded, perspective view of the barrel of the fuel injector removed from the cylinder head, showing the manner in which the tool is assembled thereto.

Referring now to the drawings and more particularly to FIG. 1, in order to place the invention in its proper environment, there is shown the head H of a cylinder having valve springs V and bridge springs B mounted thereon surrounding a fuel injector F. The fuel injector F itself comprises a main body portion M and a yoke Y to which the fuel lines L are attached. An overflow port P (FIG. 4) extends transversely through the opposite wall of he main body portion M from yoke Y at a point slightly above the level of the cylinder head H.

Describing now the tool itself, as best illustrated in FIG. 2, an elongated thrust or anchor bar 10, preferably rectangular in cross section, comprises the body portion of the tool. A transversely protruding bearing pin 12 formed of blue steel or a similar hard material is secured to one flat wall 11 of the bar and is of such a size and shape as to fit snugly within overflow port P in he fuel injector F with the wall 11 engaging against the side of the injector. When thrust bar 10 is positioned on the surface of the cylinder head H, pin 12 is properly spaced from the cylinder head to slide into the overflow port P providing a bearing surface for lifting and freeing the injector.

III

A lug 14 is positioned adjacent the opposite wall 13 of thrust bar 10 and is retained thereagainst by a pair of bracket arms 16 and I8 suitably secured at one end thereof to the sides of lug 14. A pin 20 extending transversely through thrust bar 10 receives the other end of bracket arms 16 and 18 for allowing a slight pivotal movement of lug 14 with respect to thrust bar 10. Lug 14 further includes a threaded passageway extending therethrough generally parallel to the longitudinal axis of thrust bar 10 and receiving a threaded shaft 22.

In operation, threaded shaft 22 is turned upwardly until the lower end 24 thereof is slightly above the flat base end 15 of thrust bar 10. Thrust bar 10 is then positioned with base 15 thereof resting on cylinder head H and the pin 12 inserted into the overflow port P of the fuel injector F Threaded shaft 22 is then turned downwardly until the lower end 24 thereof bears against the upper surface of cylinder head H. Further down turning of the shaft 22 transmits an upward or lifting force through pin 12 to the fuel injector F itself to effect a direct freeing of the fuel injector from its position within the bore in the cylinder head H. The injector may then be easily lifted out. The compact nature of the tool, including in effect a single point contact with the head, enables its use in the confined area about the fuel injector.

As stated hereinabove, lug I4 is pivotally attached to thrust bar 10 through arms 16 and I8 and pivot pin 20. It should be realized that lug I4 is retained in position very close to the wall 13 of thrust bar 10 and although the lug 14 is slightly pivotal around the axis of pivot pin 20, this movement is very slight for the purpose of correcting slight variations in the alignment of threaded shaft 22 and to insure that the force applied will always be in a vertical direction. The elongation of the thrust bar 22 both above and below the pin 20 is significant in efiecting a stabilization of the tool and fuel injector relative to each other during the raising of the injector.

It is to be understood that the embodiment of the invention described hereinabove is for the purpose of illustration only, and various changes may be made in the specific structure of the tool without departing from the spirit and scope of the invention.

What is claimed as new is as follows:

1. For use in the releasing and removing of a fuel injector from a cylinder head through the efi'ecting of a direct pull thereon, a tool, said tool comprising an elongated thrust bar, a bearing pin secured to one side of said bar and extending perpendicularly therefrom for engagement within the overflow port of a fuel injector, a lug having a threaded passageway therethrough attached to another side of said thrust bar, said passageway extending approximately parallel to the longitudinal axis of said thrust bar, and a threaded shaft extending through said threaded passageway, said shaft being selectively extensible below said thrust bar for bearing engagement of the lower end of the shaft with the surface of a cylinder head when a fuel injector is to be removed therefrom.

2. The tool of claim I wherein said lug is pivotally attached to said thrust bar.

3. The tool of claim 2 wherein said thrust bar projects both above and below said pin.

4. The tool of claim 3 wherein the side of said thrust bar receiving said pin is flat and engageable against a fuel injector during the removal thereof.

5. The tool of claim 4 wherein the lower end of the shaft constitutes the sole point of engagement of the tool with the cylinder head during the removal of a fuel injector therefrom.

6. The tool of claim 5 wherein said bearing pin is spaced above the lower end of said thrust bar a distance equal to the distance between a cylinder head and the overflow port of a fuel injector mounted therein.

7. The tool of claim 1 wherein the lower end of the shaft constitutes the sole point of engagement of the tool with the cylinder head during the removal of a fuel injector therefrom.

8. The tool of claim 1 wherein said bearing pin is spaced above the lower end of said thrust bar a distance equal to the distance between a cylinder head and the overflow port of a fuel injector mounted therein. 

1. For use in the releasing and removing of a fuel injector from a cylinder head through the effecting of a direct pull thereon, a tool, said tool comprising an elongated thrust bar, a bearing pin secured to one side of said bar and extending perpendicularly therefrom for engagement within the overflow port of a fuel injector, a lug having a threaded passageway therethrough attached to another side of said thrust bar, said passageway extending approximately parallel to the longitudinal axis of said thrust bar, and a threaded shaft extending through said threaded passageway, said shaft being selectiVely extensible below said thrust bar for bearing engagement of the lower end of the shaft with the surface of a cylinder head when a fuel injector is to be removed therefrom.
 2. The tool of claim 1 wherein said lug is pivotally attached to said thrust bar.
 3. The tool of claim 2 wherein said thrust bar projects both above and below said pin.
 4. The tool of claim 3 wherein the side of said thrust bar receiving said pin is flat and engageable against a fuel injector during the removal thereof.
 5. The tool of claim 4 wherein the lower end of the shaft constitutes the sole point of engagement of the tool with the cylinder head during the removal of a fuel injector therefrom.
 6. The tool of claim 5 wherein said bearing pin is spaced above the lower end of said thrust bar a distance equal to the distance between a cylinder head and the overflow port of a fuel injector mounted therein.
 7. The tool of claim 1 wherein the lower end of the shaft constitutes the sole point of engagement of the tool with the cylinder head during the removal of a fuel injector therefrom.
 8. The tool of claim 1 wherein said bearing pin is spaced above the lower end of said thrust bar a distance equal to the distance between a cylinder head and the overflow port of a fuel injector mounted therein. 